The indexOf() method searches the array for the specified item, and returns its Return Value: A Number, representing the position of the specified item,  2017年5月8日 方法一： indexOf. 使用原生JavaScript 的 Array.prototype. 3, 6, 10, 99, 101]; var filteredNum = numbers.filter(function(value) { return value > 10; });  JavaScript | Array.findIndex() Method. It returns index of the first element in a given array that satisfies the provided testing function. Otherwise -1 is returned. In JavaScript, findIndex() is an Array method that is used to return the index of the first element in the array that meets a specific criteria. Because the findIndex()  JavaScript findIndex() 方法JavaScript Array 对象实例获取数组中年龄大于等于18 的第一个元素索引位置[mycode3 type='js'] var ages = [3, 10, 18, 20]; function 

JavaScript | Array.findIndex() Method. It returns index of the first element in a given array that satisfies the provided testing function. Otherwise -1 is returned.

JavaScript | Array.findIndex() Method. It returns index of the first element in a given array that satisfies the provided testing function. Otherwise -1 is returned. It does not execute the function once it finds an element satisfying the testing function. It does not change the original array. The findIndex() method returns the index of the first element in the array that satisfies the provided testing function. Otherwise -1 is returned. Otherwise -1 is returned. var fooArray = [5, 10, 15, 20, 25]; console.log(fooArray.findIndex(num=> { return num > 5; })); // expected output: 1 That uses the new(ish) Array#some function, which loops through the entries in the array until the function you give it returns true. The function I've given it saves the index of the matching entry, then returns true to stop the iteration. Or of course, just use a for loop. Your various iteration options are covered in this other answer.

The findIndex method executes the callback function once for every array index 0 ..length-1 (inclusive) in the array until it finds one where callback returns a truthy 

The findIndex() method returns the index of the first element in the array that satisfies the provided testing  iojs --harmony_arrays perf/benchmark.js native Array.prototype.findIndex: 6347ms findIndex: 1633ms findIndex ponyfill: 6384ms findLastIndex: 1508ms npm  If you are a JavaScript developer you are probably quite familiar with the indexOf method available on strings. The basic functionality of Array 's indexOf is very  indexOf() method in that it returns -1 when it doesn't find a match. If the first element within the array matches value , $.inArray() returns 0. Because JavaScript  JavaScript Array findIndex()方法findIndex()方法返回传递测试的数组中的第一个 元素的索引（作为函数提供）。 findIndex()方法为数组中的每个元素执行一次函数：  15 Apr 2019 Rediscovering some of underrated JS arrays API methods you may not its index and source array parameters and should return value that's  17 Dec 2019 The findIndex() method of JavaScript is used to return the index of the first element in an array, if the condition is passed.The syntax is as 

2017년 1월 10일 안녕하세요, 이번에 정리한 내용은 node.js 나 javascript 사용 시 array 요소에 대한 검색에 대해서 정리 하였습니다. 1. array find - array 내용을 검색 

JavaScript Array 陣列操作方法大全( 含ES6 ) findIndex() 會將陣列中的「每一個」 元素帶入指定的函式內做判斷，並會回傳第一個符合判斷條件元素的位置號碼，  The findIndex method executes the callback function once for every array index 0 ..length-1 (inclusive) in the array until it finds one where callback returns a truthy  22 Apr 2019 Array.find() and Array.findIndex() are two new methods in JavaScript ES6. They make searching arrays more easier than before without writing 

23 Mar 2019 Metoda findIndex() zwraca indeks pierwszego elementu tablicy, który spełnia kryteria postawione w funkcji testującej. W przeciwnym wypadku 

Definition and Usage. The indexOf() method searches the array for the specified item, and returns its position. The search will start at the specified position, or at the beginning if no start position is specified, and end the search at the end of the array. Returns -1 if the item is not found. If the item is present more than once, JavaScript | Array.findIndex() Method. It returns index of the first element in a given array that satisfies the provided testing function. Otherwise -1 is returned. It does not execute the function once it finds an element satisfying the testing function. It does not change the original array. The findIndex() method returns the index of the first element in the array that satisfies the provided testing function. Otherwise -1 is returned. Otherwise -1 is returned. var fooArray = [5, 10, 15, 20, 25]; console.log(fooArray.findIndex(num=> { return num > 5; })); // expected output: 1 That uses the new(ish) Array#some function, which loops through the entries in the array until the function you give it returns true. The function I've given it saves the index of the matching entry, then returns true to stop the iteration. Or of course, just use a for loop. Your various iteration options are covered in this other answer. If you have a plain old array, all you can do is iterate. That's what arrays are, a bunch of objects ordered by array index. – Dave Newton May 11 '12 at 19:31. Just come across this post today, for all latecomers there is a new array method Array.prototype.findIndex() in ECMAScript 2015.

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